JP7367657B2 - Current sensor and electrical control device - Google Patents

Description

The present invention relates to a current sensor and an electrical control device.

In recent years, current sensors have been used to measure the remaining battery power of hybrid electric vehicles (HEVs) and electric vehicles (EVs), to measure motor drive current, and to power control equipment such as converters and inverters. is used. As this current sensor, one equipped with a magnetic sensor including a magnetic detection element capable of detecting a magnetic field generated when a current flows through a conductor such as a bus bar is known. In a current sensor, for example, a current flowing through a conductor such as a bus bar is detected in a non-contact state by a magnetoresistive element such as an AMR element, a GMR element, or a TMR element, or a magnetic detection element such as a Hall element.

Conventionally, a current sensor is known that has a ring-shaped magnetic core having a gap, and a magnetic sensor including a magnetic detection element is disposed in the gap (see Patent Document 1). With such a structure, the magnetic flux generated from the conductor can be focused on the magnetic core, and the magnetic flux focused by the magnetic core can be applied to the magnetic detection element arranged in the air gap.

JP2019-78542A

In the current sensor disclosed in Patent Document 1, when the current flowing through the conductor becomes relatively large, the magnetic field generated from the conductor becomes stronger, which makes the magnetic core more likely to magnetically saturate, so that the output of the magnetic sensor decreases. Linearity may deteriorate. The deterioration of the linearity of the output of the magnetic sensor can be improved by widening the gap in the magnetic core or increasing the volume of the magnetic core. However, if the air gap (gap) in the magnetic core is widened, magnetic fields other than the magnetic field generated by the conductor (hereinafter sometimes referred to as "disturbance magnetic field") are more likely to be applied to the magnetic detection element, which increases the detection accuracy of the current sensor. may decrease.

In view of the above problems, an object of the present invention is to provide a current sensor and an electric control device that can suppress the influence of a disturbance magnetic field.

In order to solve the above problems, the present invention provides a current sensor for detecting magnetism generated from a current flowing in a first direction in a conductor, which includes a magnetic detection section capable of detecting the magnetism, and a magnetic collecting core. , a magnetic shield, and the magnetic flux collecting core includes a first core portion substantially parallel to the first direction, and both ends of the first core portion in a second direction perpendicular to the first direction. a second core portion and a third core portion that are continuous to each other, and the second core portion and the third core portion are arranged along a third direction perpendicular to the first direction and the second direction, respectively. The magnetic detection section extends from an end of the first core section, and the magnetic detection section is located in a core gap sandwiched between the vicinity of the end of the second core section and the vicinity of the end of the third core section in the third direction. and the magnetic shield is a plate located so as to overlap the core gap, the vicinity of the end of the second core part, and the vicinity of the end of the third core part when viewed along the third direction. When viewed along the first direction, the magnetic shield includes a side opposite to the magnetic detection section in the first core section along the third direction, and a side opposite to the magnetic detection section along the second direction. Provided is a current sensor characterized in that the current sensor is not located on the opposite side of the third core part in the second core part and on the opposite side of the second core part in the third core part along the second direction. .

The magnetic flux collecting core further includes a fourth core part continuous to the vicinity of the end of the second core part and a fifth core part continuous to the vicinity of the end of the third core part, and the fourth core part and the fifth core portions extend toward each other along the second direction, and the plate-shaped shield portion extends between the core gap and the fourth core portion when viewed along the third direction. and may be located so as to overlap the fifth core portion . The conductor may be a plate-shaped body whose thickness direction is the second direction and extends in the first direction, or a plate-shaped body whose thickness direction is the third direction and which extends in the first direction. Good too.

The magnetic shield includes two first shield parts that are continuous with both ends of the plate-shaped shield part along the first direction and extend along the third direction, and the magnetic shield includes two first shield parts that extend along the third direction. When viewed, the magnetic detection section may be located within the core gap sandwiched between the two first shield sections.

A slit portion penetrating in the second direction may be formed in the plate-shaped shield portion, and when viewed along the second direction, the longitudinal direction of the slit portion is substantially the same as the first direction. The longitudinal direction of the slit portion may substantially match the third direction. A plurality of the slit portions may be formed in the plate-shaped shield portion.

The core loss of the constituent material of the magnetic shield may be larger than the core loss of the constituent material of the magnetic collecting core, and the magnetic detection section may include a magnetoresistive element or a Hall element, and the magnetic The resistance effect element may be a GMR element or a TMR element. The conductor may be provided so as to penetrate along the first direction through a space formed by the first core part, the second core part, and the third core part of the magnetic flux collecting core.
The present invention provides an electrical control device comprising the above-mentioned current sensor.

According to the present invention, it is possible to provide a current sensor and an electric control device that can suppress the influence of a disturbance magnetic field.

FIG. 1 is a perspective view showing a schematic configuration of a first aspect of a current sensor according to an embodiment of the present invention. FIG. 2 is a side view showing a schematic configuration of a first aspect of the current sensor according to the embodiment of the present invention. FIG. 3 is a side view showing a schematic configuration of a first aspect of the current sensor according to the embodiment of the present invention. FIG. 4 is a partially enlarged cutaway end view showing a schematic configuration of a first aspect of the current sensor according to the embodiment of the present invention. FIG. 5A is a side view for explaining the influence of a disturbance magnetic field in the X direction on a current sensor that has a magnetism collecting core with a relatively narrow core gap and does not have a magnetic shield. FIG. 5B is a side view for explaining the influence of a disturbance magnetic field in the Y direction on a current sensor that has a magnetic flux collecting core with a relatively narrow core gap and no magnetic shield. FIG. 6A is a side view for explaining the influence of a disturbance magnetic field in the X direction on a current sensor that has a magnetic flux collecting core with a relatively wide core gap and does not have a magnetic shield. FIG. 6B is a side view for explaining the influence of a disturbance magnetic field in the Y direction on a current sensor that has a magnetic flux collecting core with a relatively wide core gap and does not have a magnetic shield. FIG. 6C is a side view for explaining the influence of a disturbance magnetic field in the X direction on a current sensor having a magnetic flux collecting core and a magnetic shield with a relatively wide core gap. FIG. 7 is a block diagram showing a schematic configuration of a current sensor according to an embodiment of the present invention. FIG. 8 is a circuit diagram schematically showing the circuit configuration of the magnetic detection section in the embodiment of the present invention. FIG. 9 is a perspective view showing a schematic configuration of one aspect of a magnetoresistive element according to an embodiment of the present invention. FIG. 10 is a cut end view showing a schematic configuration of one aspect of the magnetoresistive element according to the embodiment of the present invention. FIG. 11A is a perspective view showing a schematic configuration of a modification of the first aspect of the current sensor according to the embodiment of the present invention. FIG. 11B is a perspective view showing a schematic configuration of a modification of the first aspect of the current sensor according to the embodiment of the present invention. FIG. 11C is a perspective view showing a schematic configuration of a modification of the first aspect of the current sensor according to the embodiment of the present invention. FIG. 11D is a perspective view showing a schematic configuration of a modification of the first aspect of the current sensor according to the embodiment of the present invention. FIG. 12A is a side view for explaining the influence of a disturbance magnetic field in the Y direction on the current sensor according to the embodiment of the present invention. FIG. 12B is a side view for explaining the influence of a disturbance magnetic field in the Y direction in a modified example of the current sensor according to the embodiment of the present invention. FIG. 12C is a side view for explaining the influence of a disturbance magnetic field in the Y direction in a modified example of the current sensor according to the embodiment of the present invention. FIG. 13 is a perspective view showing a schematic configuration of a second aspect of the current sensor according to the embodiment of the present invention. FIG. 14 is a side view showing a schematic configuration of a second aspect of the current sensor according to the embodiment of the present invention. FIG. 15 is a side view showing a schematic configuration of a second aspect of the current sensor according to the embodiment of the present invention. FIG. 16 is a partially enlarged cutaway end view showing a schematic configuration of a second aspect of the current sensor according to the embodiment of the present invention. FIG. 17A is a side view for explaining the influence of a disturbance magnetic field in the Y direction in the second aspect of the current sensor according to the embodiment of the present invention. FIG. 17B is a side view for explaining the influence of a disturbance magnetic field in the X direction in the second aspect of the current sensor according to the embodiment of the present invention. FIG. 18A is a perspective view showing a schematic configuration of a modification of the second aspect of the current sensor according to the embodiment of the present invention. FIG. 18B is a perspective view showing a schematic configuration of a modification of the second aspect of the current sensor according to the embodiment of the present invention. FIG. 18C is a perspective view showing a schematic configuration of a modification of the second aspect of the current sensor according to the embodiment of the present invention. FIG. 18D is a perspective view showing a schematic configuration of a modification of the second aspect of the current sensor according to the embodiment of the present invention. FIG. 19 is a side view for explaining the influence of a disturbance magnetic field in the Y direction in a modification of the second aspect of the current sensor according to the embodiment of the present invention. FIG. 20 is a perspective view showing a schematic configuration of a third aspect of the current sensor according to the embodiment of the present invention. FIG. 21 is a side view showing a schematic configuration of a third aspect of the current sensor according to the embodiment of the present invention. FIG. 22 is a side view showing a schematic configuration of a third aspect of the current sensor according to the embodiment of the present invention. FIG. 23A is a perspective view showing a schematic configuration of a modification of the third aspect of the current sensor according to the embodiment of the present invention. FIG. 23B is a perspective view showing a schematic configuration of a modification of the third aspect of the current sensor according to the embodiment of the present invention. FIG. 23C is a perspective view showing a schematic configuration of a modification of the third aspect of the current sensor according to the embodiment of the present invention. FIG. 23D is a perspective view showing a schematic configuration of a modification of the third aspect of the current sensor according to the embodiment of the present invention. FIG. 24 is a perspective view showing a schematic configuration of a fourth aspect of the current sensor according to the embodiment of the present invention. FIG. 25 is a side view showing a schematic configuration of a fourth aspect of the current sensor according to the embodiment of the present invention. FIG. 26 is a side view showing a schematic configuration of a fourth aspect of the current sensor according to the embodiment of the present invention. FIG. 27A is a perspective view showing a schematic configuration of a modification of the fourth aspect of the current sensor according to the embodiment of the present invention. FIG. 27B is a perspective view showing a schematic configuration of a modification of the fourth aspect of the current sensor according to the embodiment of the present invention. FIG. 27C is a perspective view showing a schematic configuration of a modification of the fourth aspect of the current sensor according to the embodiment of the present invention. FIG. 27D is a perspective view showing a schematic configuration of a modification of the fourth aspect of the current sensor according to the embodiment of the present invention. FIG. 28 is a perspective view showing a schematic configuration of a fifth aspect of the current sensor according to the embodiment of the present invention. FIG. 29 is a side view showing a schematic configuration of a fifth aspect of the current sensor according to the embodiment of the present invention. FIG. 30 is a side view showing a schematic configuration of a fifth aspect of the current sensor according to the embodiment of the present invention. FIG. 31A is a perspective view showing a schematic configuration of a modification of the fifth aspect of the current sensor according to the embodiment of the present invention. FIG. 31B is a perspective view showing a schematic configuration of a modification of the fifth aspect of the current sensor according to the embodiment of the present invention. FIG. 31C is a perspective view showing a schematic configuration of a modification of the fifth aspect of the current sensor according to the embodiment of the present invention. FIG. 31D is a perspective view showing a schematic configuration of a modification of the fifth aspect of the current sensor according to the embodiment of the present invention. FIG. 32 is a graph showing the frequency characteristics due to the iron loss difference between the constituent materials of the magnetic flux collecting core and the constituent materials of the magnetic shield in the current sensor.

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a first aspect of the current sensor according to the present embodiment, and FIG. 2 is a side view showing a schematic configuration of the first aspect of the current sensor according to the present embodiment. FIG. 3 is a side view showing a schematic configuration of the first aspect of the current sensor according to the present embodiment, and FIG. 4 is a partially enlarged cut-away end view showing the schematic configuration of the first aspect of the current sensor according to the present embodiment. It is.

In describing this embodiment, "first direction, second direction, and third direction" are defined in some drawings as necessary. Here, the first direction is the direction of current flowing through the conductor. The second direction is a direction perpendicular to the first direction, and is the width direction of the conductor in the first to third aspects and the fifth aspect, and the thickness direction of the conductor in the fourth aspect. The third direction is a direction perpendicular to the first direction and the second direction, and is the thickness direction of the conductor in the first to third aspects and the fifth aspect, and the width direction of the conductor in the fourth aspect. Note that in this specification and the drawings, the first direction may be referred to as the "Z direction," the second direction may be referred to as the "X direction," and the third direction may be referred to as the "Y direction."

As shown in FIGS. 1 to 4, the first aspect of the current sensor 1 according to the present embodiment includes a magnetic detection section 2 capable of detecting magnetism, a magnetic flux collecting core 3, a magnetic shield 4, and a current sensor 1 in the Z direction. The conductor 5 is provided with a conductor 5 through which the current flows.

The magnetic flux collecting core 3 includes a first core part 31 that is substantially parallel to the Z direction, and a second core that is continuous to both ends 31A and 31B of the first core part 31 in the X direction and extends in the Y direction (+Y direction). 32 and the third core part 33, a fourth core part 34 that is continuous with the end part 32A of the second core part 32 in the Y direction and extends in the X direction (-X direction), and a fourth core part 34 of the third core part 33 in the Y direction. It has a fifth core part 35 that is continuous with the end part 33A and extends in the X direction (+X direction). The fourth core part 34 and the fifth core part 35 extend along the X direction from the end 32A of the second core part 32 and the end 33A of the third core part 33 so that their end surfaces approach each other. . The gap (space) sandwiched between the end faces of the fourth core part 34 and the end faces of the fifth core part 35 that face each other is the core gap CG. That is, the magnetic flux collecting core 3 has a ring shape with a core gap CG, and is a substantially C-shaped core when viewed along the Z direction.

In this embodiment, a continuous part between the end 31A of the first core part 31 and the second core part 32 of the magnetic flux collecting core 3, a continuous part between the end 31B of the first core part 31 and the third core part 33, The continuous part between the end 32A of the second core part 32 and the fourth core part 34 and the continuous part between the end 33A of the third core part 33 and the fifth core part 35 have a curved shape (rounded corner shape). ), but is not limited to this aspect. For example, these continuous parts may have a bent shape (a shape with corners) or a C-chamfered shape with chamfered corners.

The length L _CG of the core gap CG in the X direction (the distance in the X direction between the end face of the fourth core part 34 and the end face of the fifth core part 35) may be, for example, 6 mm or more, and may be about 6 to 12 mm. Good to have. Since the length L _CG is 6 mm or more, the effect of the current sensor 1 according to the present embodiment including the magnetic shield 4, that is, the disturbance magnetic field is prevented from being applied to the magnetic detection section 2 by the magnetic shield 4. The suppressing effect can be effectively achieved.

Assuming that the current sensor 1 according to the present embodiment does not include the magnetic shield 4, the length L _CG of the core gap CG in the X direction is relatively small, and the end face of the fourth core part 34 and the fifth core part 35 are relatively small. If the end face of is close to the magnetic detection _section 2, the disturbance magnetic field _H (See FIGS. 5A and 5B). That is, the current sensor becomes less susceptible to the influence of the disturbance magnetic fields _H.sub.X and _H.sub.Y. On the other hand, when the current flowing through the conductor 5 becomes large, the magnetic flux collecting core 3 is likely to be magnetically saturated, and the linearity of the output of the magnetic detection section 2 may deteriorate. In order to improve the linearity of the output of the magnetic detection unit 2, the length L _CG of the core gap CG in the X direction is made relatively large (for example, 6 mm or more), and the end face of the fourth core part 34 and the fifth core part 35 are made relatively large (for example, 6 mm or more). If the end face of is separated from the magnetic detection unit 2, the magnetic collecting core 3 becomes difficult to be magnetically saturated, but both the disturbance magnetic field H in the _X direction and the disturbance magnetic field H in the _Y direction reach the magnetic detection unit 2. (See FIGS. 6A and 6B). Like the current sensor 1 according to the present embodiment, by providing the magnetic shield 4 so as to overlap the core gap CG when viewed along the Y direction, at least the disturbance magnetic field _HX in the X direction is collected. It can be guided by the core 3 and magnetic shield 4 (see FIG. 6C). Therefore, application of the disturbance magnetic field _HX in at least the X direction to the magnetic detection section 2 can be suppressed.

The width W ₃ of the magnetic flux collecting core 3 in the Z direction may be approximately 5 to 20 mm. In the current sensor 1 according to the present embodiment, the magnetic detection section 2 is arranged in the core gap CG of the magnetic flux collecting core 3. However, if the width _W3 is relatively small (for example, less than 5 mm), magnetic field is generated from the conductor 5. There is a possibility that the magnetic flux collecting core 3 becomes easily magnetically saturated due to the magnetic flux. On the other hand, if the width _W3 becomes relatively large, the size of the current sensor 1 becomes relatively large.

The length G ₃₄ of the gap between the magnetic shield 4 and the magnetic flux collecting core 3 in the Y direction may be, for example, 3 mm or less, and may be about 1 to 2 mm. If the length G ₃₄ of the gap exceeds 3 mm, there is a possibility that the disturbance magnetic field H _X in the X direction may pass through the gap and be applied to the magnetic detection section 2 . Further, if the length G ₃₄ of the gap is relatively short (for example, less than 1 mm), a magnetic path is formed from the magnetic flux collecting core 3 to the magnetic shield 4, and the magnetic flux easily flows to the magnetic shield 4. There is a possibility that the magnetic flux collecting core 3 becomes easily magnetically saturated and the magnetic flux to be detected by the magnetic detection section 2 decreases.

The conductor 5 made of copper or the like is a plate-shaped body whose longitudinal direction is substantially parallel to the Z direction and whose thickness direction is substantially parallel to the Y direction, and is a ring-shaped collection having a core gap CG. It is provided to penetrate inside the magnetic core 3 in the Z direction. The longitudinal direction of the conductor 5 only needs to be substantially parallel to the Z direction; for example, the axis of the conductor 5 (a line passing through the center of the conductor 5) may intersect the Z direction at an angle of 2° or less. . Further, the thickness direction of the conductor 5 only needs to be substantially parallel to the Y direction, and may intersect with the Y direction at an angle of 2° or less, for example.

The magnetic detection section 2 only needs to be provided in the core gap CG. In the first aspect of the current sensor 1 according to the present embodiment, when a current flows through the conductor 5, magnetic flux is generated from the conductor 5, and the magnetic flux is focused on the ring-shaped magnetic collecting core 3 having a core gap CG. Since the magnetic flux collecting core 3 has a ring shape with the core gap CG, the entire magnetic flux collecting core 3 including the core gap CG becomes a magnetic flux path (magnetic path). That is, it can be said that the magnetic detection unit 2 provided in the core gap CG is located in the path (magnetic path) of the magnetic flux focused on the magnetic flux collecting core 3. Therefore, in this embodiment, "the magnetic detecting section 2 is provided in the core gap CG" means that the magnetic detecting section 2 only needs to be located in the magnetic path, and the magnetic detecting section 2 is provided in the core gap CG. may be located entirely within the core gap CG, or a portion of the magnetic detection section 2 may be located within the core gap CG. Note that the detailed configuration of the magnetic detection section 2 will be described later.

The magnetic shield 4 includes a plate-shaped shield portion 41 that overlaps the core gap CG when viewed along the Y direction. When viewed along the Y direction, the plate-shaped shield portion 41 overlaps the core gap CG, so that the disturbance magnetic field _HX in the X direction is induced to the magnetic collecting core 3 and the magnetic shield 4. Therefore, it is possible to suppress the disturbance magnetic field _HX in the X direction from being applied to the magnetic detection section 2.

In this embodiment, the magnetic shield 4 is arranged so that the plate-shaped shield portion 41 completely overlaps the core gap CG when viewed along the Y direction. That is, the length L ₄₁ of the plate-shaped shield portion 41 of the magnetic shield 4 in the X direction may be greater than or equal to the length L _CG of the core gap CG in the X direction, and the length L 41 of the magnetic flux collecting core 3 in the X direction may be less than or equal to ₃ . That's fine. When the length L ₄₁ of the plate-shaped shield portion 41 in the X direction is relatively long, the shielding effect against the disturbance magnetic field H _X in the X direction can be improved. Further, the length W ₄₁ of the plate-shaped shield portion 41 in the Z direction may be equal to or greater than the length of the core gap CG in the Z direction, that is, the width W ₃ of the magnetic flux collecting core 3 in the Z direction. For example, the length L 41 of the plate-shaped shield portion ₄₁ in the X direction may be approximately equal to or greater than the length L _CG of the core gap CG in the X direction and less than or equal to the length L ₃ of the magnetic flux collecting core 3 in the X direction; The length W ₄₁ in the direction may be at least the width W ₃ of the magnetic flux collecting core 3 in the Z direction, and the width W ₃ of the magnetic collecting core 3 in the Z direction + about 8 mm. Note that the current sensor 1 according to this embodiment is not limited to this aspect. For example, the plate-shaped shield part 41 does not need to completely overlap the core gap CG, as long as the magnetic shield 4 can suppress the disturbance magnetic field _HX in the X direction from being applied to the magnetic detection part 2 at least.

The thickness (length in the Y direction) of the plate-shaped shield portion 41 is not particularly limited, but may be, for example, about 1 to 3 mm. If the thickness is relatively too thin (for example, less than 1 mm), the magnetic shield 4 is likely to be saturated, and the linearity of the output from the current sensor 1 may be adversely affected. On the other hand, if the thickness is relatively thick, the manufacturing cost of the current sensor 1 and the height dimension of the current sensor 1 may be affected.

Both the magnetic flux collecting core 3 and the magnetic shield 4 may be made of a soft magnetic material such as silicon steel, electromagnetic steel, pure iron (SUY), permalloy, etc. However, from the viewpoint of cost reduction, silicon steel, electromagnetic steel, Pure iron etc. are preferable. The core loss of the constituent material of the magnetic shield 4 only needs to be larger than the core loss of the constituent material of the magnetic flux collecting core 3. When a predetermined current flows through the conductor 5, a magnetic field generated from the conductor 5 flows to the magnetic collecting core 3 and the magnetic shield 4. As the frequency of the current flowing through the conductor 5 increases, the frequency characteristics of the magnetic shield 4 made of a material with relatively large core loss deteriorate, and the magnetic field flowing through the magnetic shield 4 relatively decreases. Although the magnetic field collecting core 3 made of a material with relatively low iron loss also has deteriorated frequency characteristics and it becomes difficult for the magnetic field to flow, the magnetic field flowing to the magnetic shield 4 is relatively reduced, so that the magnetic field flows to the magnetic collecting core 3. The magnetic field increases relatively. As a result, the magnetic flux density of the magnetic field applied to the magnetic detection section 2 is considered to be more stable than in the current sensor 1 without the magnetic shield 4. This is clear in the test examples described below, but the larger the difference in iron loss between the two, the better the frequency characteristics are and the more the attenuation of the magnetic flux density of the magnetic field applied to the magnetic detection section 2 can be suppressed. (See Figure 32). As a result, the response characteristics of the current sensor 1 to alternating current can be stabilized. The difference between the iron loss of the constituent material of the magnetic flux collecting core 3 and the iron loss of the constituent material of the magnetic shield 4 is preferably 2.0 W/kg or more, and 4.5 to 10.0 W/kg, for example. is more preferable. The iron loss is determined according to the Epstein test method based on the provisions of JIS-C-2550, and the iron loss per unit weight (rolling direction and This is the value obtained as the average in the perpendicular direction. Note that the material constituting the magnetic flux collecting core 3 may be the same type of material as the constituting material of the magnetic shield 4, or a different type of material, as long as the material has a smaller core loss than the constituting material of the magnetic shield 4. It may be. For example, if the magnetic flux collecting core 3 and the magnetic shield 4 are both made of electromagnetic steel, but the iron loss of the magnetic steel forming the magnetic shield 4 is larger than the iron loss of the electromagnetic steel forming the magnetic collecting core 3, then good.

The current sensor 1 according to this embodiment includes a magnetic detection section 2 and a signal processing section 6. The signal processing unit 6 includes an A/D (analog-to-digital) converter 61 that converts the analog signal output from the magnetic detection unit 2 into a digital signal, and calculates the digital signal digitally converted by the A/D converter 61. and a calculation unit 62 for processing. In addition, when outputting the arithmetic processing result processed by the arithmetic unit 62 as an analog signal, the signal processing unit 6 includes a D/A (digital-to-analog) converter (not shown in the figure) on the downstream side of the arithmetic unit 62. It is sufficient if it further includes (omitted).

In the present embodiment, the circuit configuration of the magnetic detection section 2 is a Wheatstone bridge formed by connecting four resistance sections: a first resistance section R1, a second resistance section R2, a third resistance section R3, and a fourth resistance section R4. The circuit C may be used, or it may be formed by connecting two resistance parts, the first resistance part R1 and the second resistance part R2, in a half-bridge connection. The first to fourth resistance parts R1 to R4 may include a single magnetoresistive element (AMR element, GMR element, TMR element, etc.) or a Hall element, or may include a plurality of magnetoresistive elements (AMR element, TMR element, etc.). (GMR element, TMR element, etc.) or a Hall element.

The Wheatstone bridge circuit C included in the magnetic detection section 2 has a power supply port V, a ground port G, two output ports E1 and E2, and a first resistance section R1 and a second resistance section R2 connected in series. It includes a third resistance section R3 and a fourth resistance section R4 connected to. One end of each of the first resistance section R1 and the third resistance section R3 is connected to the power supply port V. The other end of the first resistance section R1 is connected to one end of the second resistance section R2 and the output port E1. The other end of the third resistance section R3 is connected to one end of the fourth resistance section R4 and the output port E2. The other ends of the second resistance section R2 and the fourth resistance section R4 are connected to the ground port G. A power supply voltage of a predetermined magnitude is applied to the power supply port V, and the ground port G is connected to the ground.

In this embodiment, the first to fourth resistance sections R1 to R4 included in the Wheatstone bridge circuit C may include an MR element such as an AMR element, a GMR element, or a TMR element, or may include a Hall element. Good too. GMR elements and TMR elements consist of a magnetization fixed layer whose magnetization direction is fixed, a free layer whose magnetization direction changes depending on the direction of an applied magnetic field, and a nonmagnetic layer arranged between the magnetization fixed layer and the free layer. layer. An AMR element includes a magnetic layer having shape anisotropy.

An MR element such as a GMR element or a TMR element constituting the first to fourth resistance parts R1 to R4 includes a plurality of first electrodes 71, a plurality of MR films 80, and a plurality of second electrodes 72. That's fine. The plurality of first electrodes 71 are provided on a substrate (not shown). The first electrode 71 is also referred to as a lower lead electrode. Each first electrode 71 has an elongated shape. A gap is formed between two first electrodes 71 adjacent to each other in the longitudinal direction of the first electrodes 71 . MR films 80 are provided near both longitudinal ends of the upper surface of the first electrode 71, respectively. The MR film 80 has a substantially circular shape in plan view, and includes a free layer 81, a nonmagnetic layer 82, a magnetization fixed layer 83, and an antiferromagnetic layer 84, which are laminated in order from the first electrode 71 side. Free layer 81 is electrically connected to first electrode 71 . The antiferromagnetic layer 84 is made of an antiferromagnetic material, and plays the role of fixing the direction of magnetization of the magnetization fixed layer 83 by causing exchange coupling with the magnetization fixed layer 83. The plurality of second electrodes 72 are provided on the plurality of MR films 80. Each second electrode 72 has an elongated shape and is arranged on two first electrodes 71 adjacent to each other in the longitudinal direction of the first electrode 71, and electrically connects the antiferromagnetic layers 84 of two adjacent MR films 80. Connect to. The second electrode 72 is also referred to as an upper lead electrode. Note that the MR film 80 may have a structure in which a free layer 81, a nonmagnetic layer 82, a magnetization fixed layer 83, and an antiferromagnetic layer 84 are laminated in order from the second electrode 72 side. The magnetization pinned layer 83 has a ferromagnetic layer/non-magnetic intermediate layer/ferromagnetic layer laminated ferri structure, and both ferromagnetic layers are antiferromagnetically coupled, a so-called self-pinned pinned layer (Synthetic Ferri pinned layer, SFP layer), the antiferromagnetic layer 84 may be omitted.

In the TMR element, nonmagnetic layer 82 is a tunnel barrier layer. In the GMR element, nonmagnetic layer 82 is a nonmagnetic conductive layer. In TMR elements and GMR elements, the resistance value changes depending on the angle that the direction of magnetization of the free layer 81 makes with respect to the direction of magnetization of the fixed magnetization layer 83, and when this angle is 0° (the directions of magnetization are parallel to each other). The resistance value is the minimum when the angle is 180° (the magnetization directions are antiparallel to each other), and the resistance value is the maximum.

When the first to fourth resistance sections R1 to R4 are constituted by TMR elements or GMR elements, in the Wheatstone bridge circuit C of the magnetic detection section 2, the magnetization fixed layer 83 of the first resistance section R1 and the second resistance section R2 is The magnetization direction is parallel to the X direction, and the magnetization direction of the magnetization fixed layer 83 of the first resistance section R1 and the magnetization direction of the magnetization fixed layer 83 of the second resistance section R2 are antiparallel to each other. Further, the magnetization direction of the magnetization fixed layer 83 of the third resistance section R3 and the fourth resistance section R4 is parallel to the X direction, and the magnetization direction of the magnetization fixed layer 83 of the third resistance section R3 and the fourth resistance section R4 are parallel to the X direction. The magnetization directions of the magnetization fixed layer 83 are antiparallel to each other. In the magnetic detection unit 2, the potential difference between the output ports E1 and E2 changes in accordance with the change in the magnetic field strength of the magnetic field in the X direction generated from the conductor 5, and a signal corresponding to the potential difference between the output ports E1 and E2 becomes the sensor signal S. The signal is output to the signal processing section 6 as a signal. The difference detector (not shown) amplifies a signal corresponding to the potential difference between the output ports E1 and E2, and outputs it as a sensor signal S to the A/D converter 61 of the signal processor 6.

The A/D converter 61 converts the sensor signal S (analog signal related to current) output from the magnetic detection unit 2 into a digital signal, and the digital signal is input to the calculation unit 62. The calculation unit 62 performs calculation processing on the digital signal converted from the analog signal by the A/D conversion unit 61. This calculation unit 62 is configured by, for example, a microcomputer, an ASIC (Application Specific Integrated Circuit), or the like.

In the first aspect of the current sensor 1 according to the present embodiment, as shown in FIGS. 11A to 11D, a slit portion 42 penetrating in the Y direction may be formed in the plate-shaped shield portion 41 of the magnetic shield 4. The slit portion 42 may be formed so that its longitudinal direction is substantially parallel to the X direction (see FIG. 11A), or may be formed so that its longitudinal direction is substantially parallel to the Z direction. (see FIGS. 11B and 11C), or may be formed so that its longitudinal direction intersects the X direction and the Z direction (see FIG. 11D). One slit portion 42 may be formed in the plate-shaped shield portion 41 of the magnetic shield 4 (see FIGS. 11A, 11B, and 11D), or a plurality of slit portions 42 may be formed (see FIGS. 11A, 11B, and 11D). (see Figure 11C). The slit section 42 may be formed so as to overlap the magnetic detection section 2 when viewed along the Y direction, that is, at least a portion of the magnetic detection section 2 may be exposed from the slit section 42 ( (see FIGS. 11A, 11B, and 11D), and may be formed so as not to overlap the magnetic detection section 2 (see FIG. 11C).

In the first aspect of the current sensor 1 according to the present embodiment, if the slit portion 42 is not formed in the plate-shaped shield portion 41 of the magnetic shield 4, the disturbance magnetic field H _Y in the Y direction is 41 in the thickness direction (see FIG. 12A). Even if a disturbance magnetic field _HY in the Y direction is applied to the magnetic detection unit 2 having a sensitivity axis in the X direction, it is usually not significantly affected. However, if the sensitivity axis of the magnetic detecting section 2 is shifted from the X direction to the ±Y direction due to an assembly error of the magnetic detecting section 2 in the current sensor 1, a plate-shaped shield without the slit section 42 may be used. Since the portion 41 transmits the disturbance magnetic field H _Y in the Y direction in the thickness direction of the plate-shaped shield portion 41, there is a possibility that the current sensor 1 will be affected by the disturbance magnetic field H _Y.

On the other hand, since the slit part 42 is formed in the plate-shaped shield part 41, the disturbance magnetic field _H can be dispersed on both sides). Therefore, when the slit section 42 is formed so as to overlap the magnetic detection section 2 when viewed along the Y direction, the disturbance magnetic field H _Y directed toward the magnetic detection section 2 along the Y direction is transmitted to the magnetic detection section. 2 can be suppressed from being applied (see FIG. 12B).

Note that if the slit portion 42 is formed so as not to overlap the magnetic detection section 2 when viewed along the Y direction, the disturbance magnetic field H _Y directed toward the magnetic detection section 2 along the Y direction will cause magnetic detection. Although it is difficult to suppress the disturbance magnetic field HY from being applied to the magnetic shield section 2, it is possible to suppress the disturbance magnetic field _HY that wraps around from the outside of the magnetic shield 4 and is induced into the magnetic shield 4 from affecting the current sensor 1. (See Figure 12C).

In the embodiment shown in FIG. 11A, the length L ₄₂ in the longitudinal direction (X direction) of the slit portion 42 may be shorter or longer than the length L _CG in the X direction of the core gap CG. The length L may be the same as _CG . In the embodiments shown in FIGS. 11A to 11D, the length W ₄₂ of the slit portion 42 in the transverse direction may be, for example, about 1 to 4 mm, and preferably about 2 to 3 mm. If the length W ₄₂ is less than 1 mm, the slit portion 42 will not be able to effectively disperse the disturbance magnetic field _HY , and the disturbance magnetic field _HY will damage the plate-shaped shield portion 41 of the magnetic shield 4 in the thickness direction. There is a possibility that the magnetic field is transmitted through the magnetic field and applied to the magnetic detection section 2. Furthermore, if the length W exceeds ₄ mm, there is a risk that the disturbance magnetic field _H in the Y direction may pass through the slit section 42 and be applied to the magnetic detection section 2.

According to the first aspect of the current sensor 1 according to the present embodiment, the magnetic shield 4 is provided so as to overlap the core gap CG of the magnetic flux collecting core 2 when viewed from the Y direction, so that at least The disturbance magnetic field _HX can be induced into the magnetic flux collecting core 2 and the magnetic shield 4, and the influence of the disturbance magnetic field _HX can be suppressed. Therefore, according to the first aspect of the current sensor 1 according to the present embodiment, the current flowing through the conductor 5 can be detected with high accuracy.

A second aspect of the current sensor 1 according to this embodiment will be described. Note that the same configurations as those in the first aspect are given the same reference numerals, and detailed explanations thereof will be omitted. As shown in FIGS. 13 to 16, the second embodiment of the current sensor 1 includes a magnetic detection section 2 capable of detecting magnetism, a magnetic flux collecting core 3, a magnetic shield 4, and a conductor 5 through which current flows in the Z direction. Be prepared.

The magnetic shield 4 includes a first shield part 43 and a second shield part 44 that are continuous with both ends 41A and 41B of the plate-shaped shield part 41 in the Z direction and extend along the Y direction. The length L ₄₁ of the plate-shaped shield portion 41 in the X direction is the same as the length L 43 of the first shield portion ₄₃ in the X direction and the length of the second shield portion 44 in the X direction. That is, the magnetic shield 4 has a substantially U-shape when viewed along the X direction.

In the second aspect of the current sensor 1 according to the present embodiment, the magnetic shield 4 includes a first shield part 43 and a second shield part 44 that are continuous to both ends 41A and 41B of the plate-shaped shield part 41 in the Z direction. The first shield part 43 and the second shield part 44 extend from both ends 41A, 41B of the plate-shaped shield part 41 in the -Y direction. Since the magnetic shield 4 includes the first shield part 43 and the second shield part 44, the disturbance magnetic field H _Y in the Y direction is induced to the first shield part 43 and the second shield part 44 (see FIG. 17A). ), it is possible to suppress the disturbance magnetic field H _Y from being applied to the magnetic detection section 2 . Further, since the disturbance magnetic field _HX in the X direction is induced from the fourth core part 34 or the fifth core part 35 of the magnetic flux collecting core 3 to the first shield part 43 and the second shield part 44 (see FIG. 17B), Application of the disturbance magnetic field _HX to the magnetic detection section 2 can be suppressed.

The lengths T ₄₃ and T ₄₄ of the first shield part 43 and the second shield part 44 in the Y direction are not particularly limited as long as they do not contact the conductor 5, but when viewed along the Z direction In addition, it is preferable that the length is at least enough to completely overlap the core gap CG (see FIG. 16). When viewed along the Z direction, the first shield part 43 and the second shield part 44 completely overlap the core gap CG, so that the disturbance magnetic field H in _{the X} direction and the disturbance magnetic field H in the _Y direction are reduced. Both can be effectively suppressed from being applied to the magnetic detection section 2. The lengths T ₄₃ and T ₄₄ may be, for example, about 6 to 10 mm. Note that the length T 43 of the first shield portion ₄₃ in the Y direction and the length T ₄₄ of the second shield portion 44 in the Y direction may be the same or different.

In this embodiment, both end portions 41A and 41B of the plate-shaped shield portion 41 and continuous portions of the first shield portion 43 and the second shield portion 44 have a curved shape (rounded corner shape). , but is not limited to this embodiment. For example, these continuous parts may have a bent shape (a shape with corners) or a C-chamfered shape with chamfered corners.

In the second aspect of the current sensor 1 according to the present embodiment, as shown in FIGS. 18A to 18D, a slit portion 42 penetrating in the Y direction may be formed in the plate-shaped shield portion 41 of the magnetic shield 4. The slit portion 42 may be formed so that its longitudinal direction is substantially parallel to the X direction (see FIG. 18A), or may be formed so that its longitudinal direction is substantially parallel to the Z direction. (see FIGS. 18B and 18C), or may be formed so that its longitudinal direction intersects the X direction and the Z direction (see FIG. 18D). One slit portion 42 may be formed in the plate-shaped shield portion 41 of the magnetic shield 4 (see FIGS. 18A, 18B, and 18D), or a plurality of slit portions 42 may be formed (see FIGS. 18A, 18B, and 18D). (see Figure 18C). The slit section 42 may be formed so as to overlap the magnetic detection section 2 when viewed along the Y direction, that is, at least a portion of the magnetic detection section 2 may be exposed from the slit section 42 ( (see FIGS. 18A, 18B, and 18D), and may be formed so as not to overlap the magnetic detection section 2 (see FIG. 18C).

In the second aspect of the current sensor 1 according to the present embodiment, the disturbance magnetic field _H in the Y direction is easily induced in the first shield part 43 and the second shield part 44, but If the portion 42 is not formed, a part of the disturbance magnetic field H _Y in the Y direction will be transmitted in the thickness direction of the plate-shaped shield portion 41 of the magnetic shield 4 (see FIG. 17A). As a result, the current sensor 1 may be affected by the disturbance magnetic field _HY .

On the other hand, since the slit part 42 is formed in the plate-shaped shield part 41, the disturbance magnetic field _H (both sides in the Z direction)), making it easier to more effectively induce the disturbance magnetic field _HY to the first shield part 43 and the second shield part 44. Therefore, when the slit section 42 is formed so as to overlap the magnetic detection section 2 when viewed along the Y direction, the disturbance magnetic field H _Y directed toward the magnetic detection section 2 along the Y direction is transmitted to the magnetic detection section. 2 can be effectively suppressed (see FIG. 19).

Note that if the slit portion 42 is formed so as not to overlap the magnetic detection portion 2 when viewed along the Y direction, the disturbance magnetic field that wraps around from the outside of the magnetic shield 4 and is induced into the magnetic shield 4 It is possible to suppress H _Y from affecting the current sensor 1 (see FIG. 12C).

In the embodiment shown in FIG. 18A, the length L ₄₂ in the longitudinal direction (X direction) of the slit portion 42 may be shorter or longer than the length L _CG in the X direction of the core gap CG. The length L may be the same as _CG . In the embodiments shown in FIGS. 18A to 18D, the length W ₄₂ of the slit portion 42 in the transverse direction may be, for example, about 1 to 4 mm, and preferably about 2 to 3 mm. If the length W ₄₂ is less than 1 mm, the effect of dispersing the disturbance magnetic field _HY by the slit portion 42 decreases, and the disturbance magnetic field _HY that passes through the plate-shaped shield portion 41 of the magnetic shield 4 in the thickness direction becomes magnetic. There is a possibility that the voltage may be applied to the detection unit 2. Furthermore, if the length W exceeds ₄ mm, there is a risk that the disturbance magnetic field _H in the Y direction may pass through the slit section 42 and be applied to the magnetic detection section 2.

In the second aspect of the current sensor 1 according to the present embodiment having the above-described configuration, the magnetic shield 4 includes a first shield part 43 and a second shield part 44 that are continuous with both ends 41A and 41B of the plate-shaped shield part 41. By including it, the disturbance magnetic field H _Y in the Y direction can be guided to the first shield part 43 and the second shield part 44. Further, the disturbance magnetic field _HX in the X direction is guided to the plate-shaped shield portion 41 of the magnetic shield 4 and the magnetic collecting core 3. Therefore, according to the second aspect of the current sensor 1, it is possible to suppress detection errors caused by the disturbance magnetic field _HX in the X direction and the disturbance magnetic field _HY in the Y direction.

A third aspect of the current sensor 1 according to this embodiment will be described. Note that the same components as in the first and second aspects are given the same reference numerals, and detailed description thereof will be omitted. As shown in FIGS. 20 to 22, the third aspect of the current sensor 1 includes a magnetic detection section 2 capable of detecting magnetism, a magnetic flux collecting core 3, a magnetic shield 4, and a conductor 5 through which current flows in the Z direction. Be prepared.

The magnetic flux collecting core 3 includes a first core part 31, a second core part 32 and a third core part 33 that are continuous to both ends 31A and 31B of the first core part 31, and a predetermined portion of the second core part 32 in the Y direction. A fourth core part 34 is continuous with the position 321 of the third core part 33 and extends along the X direction, and a fifth core part 35 is continuous with a predetermined position 331 of the third core part 33 in the Y direction and extends along the X direction. include. The second core part 32 extends further in the Y direction from a continuous part 321 with the fourth core part 34, and the third core part 33 further extends in the Y direction from a continuous part 331 with the fifth core part 35. It extends along. That is, the fourth core part 34 is not continuous with the end 32A of the second core part 32, and the fifth core part 35 is not continuous with the end 33A of the third core part 33. The fourth core part 34 and the fifth core part 35 extend along the X direction so that their end surfaces are brought closer to each other. A gap (space) sandwiched between the end face of the fourth core part 34 and the end face of the fifth core part 35 is the core gap CG.

In the third aspect of the current sensor 1 according to the present embodiment, the second core part 32 extends along the Y direction from a continuous part 321 with the fourth core part 34 in the second core part 32, and Since the third core part 33 extends along the Y direction from the continuous part 331 with the fifth core part 35 in the third core part 33, the disturbance magnetic field _HX in the X direction is transferred to the first core of the magnetic collecting core 3. 31 side and the end 32A side of the second core part 32 or the end 33A side of the third core part 33, and the influence of the disturbance magnetic field _HX can be suppressed.

In this embodiment, a continuous part between the end 31A of the first core part 31 and the second core part 32 of the magnetic flux collecting core 3, a continuous part between the end 31B of the first core part 31 and the third core part 33, The continuous part 321 between the second core part 32 and the fourth core part 34 and the continuous part 331 between the third core part 33 and the fifth core part 35 both have a bent shape (shape with corners). However, it is not limited to this embodiment. For example, these continuous parts may have a curved shape (rounded corner shape) or a C-chamfered shape with chamfered corners.

When the magnetism collecting core 3 is positioned so that the first core part 31 extends downward and the second core part 32 and third core part 33 extend upward from both ends 31A and 31B of the first core part 31, the magnetic The plate-shaped shield part 41 of the shield 4 is arranged above the fourth core part 34 and the fifth core part 35 so as to be sandwiched between the second core part 32 and the third core part 33 in the X direction. . In the third aspect of the current sensor 1 having such a configuration, the length T ₃₂₂ along the Y direction from the continuous portion 321 of the fourth core portion 34 to the end portion 32A in the second core portion 32 and the third core portion The length T ₃₃₂ along the Y direction from the continuous portion 331 of the fifth core portion 35 to the end portion 33A at 33 is not particularly limited. For example, the lengths T ₃₂₂ and T ₃₃₂ may be such that the end portion 32A of the second core portion 32 and the end portion 33A of the third core portion 33 protrude above the plate-shaped shield portion 41. Alternatively, the length may be such that the plate-shaped shield portion 41 protrudes above the end portion 32A of the second core portion 32 and the end portion 33A of the third core portion 33. Further, the lengths T ₃₂₂ and T ₃₃₂ may be such that the upper surface of the plate-shaped shield portion 41 and both end portions 32A and 33A are located on the same plane (XZ plane).

The length G ₃₄ of the gap in the Y direction between the magnetic shield 4 (plate-shaped shield part 41) and the magnetic flux collecting core 3 (fourth core part 34 and fifth core part 35) may be, for example, 3 mm or less, It may be about 1 to 2 mm. If the length G of the gap exceeds ₃ mm, the disturbance magnetic field _H in the Y direction wraps around from the outside of the end face of the magnetic shield 4 in the Z direction toward the magnetic detection unit 2 and is applied to the magnetic detection unit 2. There is a risk. In addition, if the length G ₃₄ of the gap is relatively short (for example, less than 1 mm), a magnetic path is formed from the magnetic flux collecting core 3 through the magnetic shield 4, and the magnetic flux easily flows to the magnetic shield 4. There is a possibility that the magnetic flux collecting core 3 becomes easily magnetically saturated and the magnetic flux to be detected by the magnetic detection section 2 decreases.

In this embodiment, the magnetic shield 4 is arranged so that the plate-shaped shield portion 41 completely overlaps the core gap CG when viewed along the Y direction. That is, the length L ₄₁ in the X direction and the length W ₄₁ in the Z direction of the plate-shaped shield portion 41 of the magnetic shield 4 are greater than or equal to the length L _CG in the X direction and the length in the Z direction of the core gap CG, that is, the The width W of the magnetic core 3 in the Z direction may be at least ₃ . For example, the length L 41 of the plate-shaped shield portion ₄₁ in the X direction may be approximately equal to or greater than the length L _CG of the core gap CG in the X direction and less than or equal to the length L ₃ of the magnetic flux collecting core 3 in the X direction; The length W ₄₁ in the direction may be at least the width W ₃ of the magnetic flux collecting core 3 in the Z direction, and the width W ₃ of the magnetic collecting core 3 in the Z direction + about 8 mm. Note that the third aspect of the current sensor 1 according to the present embodiment is not limited to this aspect. For example, as long as the magnetic shield 4 can suppress the disturbance magnetic field _HY in the Y direction from being applied to the magnetic detection section 2, the plate-shaped shield section 41 does not need to completely overlap the core gap CG.

In the third aspect of the current sensor 1 according to the present embodiment, as shown in FIGS. 23A to 23D, a slit portion 42 penetrating in the Y direction may be formed in the plate-shaped shield portion 41 of the magnetic shield 4. The slit portion 42 may be formed so that its longitudinal direction is substantially parallel to the X direction (see FIG. 23A), or may be formed so that its longitudinal direction is substantially parallel to the Z direction. (see FIGS. 23B and 23C), or may be formed so that its longitudinal direction intersects the X direction and the Z direction (see FIG. 23D). One slit portion 42 may be formed in the plate-shaped shield portion 41 of the magnetic shield 4 (see FIGS. 23A, 23B, and 23D), or a plurality of slit portions 42 may be formed (see FIGS. 23A, 23B, and 23D). (see Figure 23C). The slit section 42 may be formed so as to overlap the magnetic detection section 2 when viewed along the Y direction, that is, at least a portion of the magnetic detection section 2 may be exposed from the slit section 42 ( (see FIGS. 23A, 23B, and 23D), and may be formed so as not to overlap the magnetic detection section 2 (see FIG. 23C).

In the third aspect of the current sensor 1 according to the present embodiment, if the slit portion 42 is not formed in the plate-shaped shield portion 41 of the magnetic shield 4, a part of the disturbance magnetic field H _Y in the Y direction The light is transmitted in the thickness direction of the shaped shield portion 41 (see FIG. 12A). As a result, the current sensor 1 may be affected by the disturbance magnetic field _HY .

On the other hand, since the slit part 42 is formed in the plate-shaped shield part 41, the disturbance magnetic field _H (Both sides in the Z direction). Therefore, when the slit section 42 is formed so as to overlap the magnetic detection section 2 when viewed along the Y direction, the disturbance magnetic field H _Y directed toward the magnetic detection section 2 along the Y direction is transmitted to the magnetic detection section. 2 can be effectively suppressed (see FIG. 12B).

Note that if the slit portion 42 is formed so as not to overlap the magnetic detection portion 2 when viewed along the Y direction, the disturbance magnetic field that wraps around from the outside of the magnetic shield 4 and is induced into the magnetic shield 4 It is possible to suppress H _Y from affecting the current sensor 1 (see FIG. 12C).

In the embodiment shown in FIG. 23A, the length L ₄₂ in the longitudinal direction (X direction) of the slit portion 42 may be shorter or longer than the length L _CG in the X direction of the core gap CG. The length L may be the same as _CG . In the embodiments shown in FIGS. 23A to 23D, the length W ₄₂ of the slit portion 42 in the transverse direction may be, for example, about 1 to 4 mm, and preferably about 2 to 3 mm. If the length W ₄₂ is less than 1 mm, the effect of dispersing the disturbance magnetic field _HY by the slit portion 42 decreases, and the disturbance magnetic field _HY that passes through the plate-shaped shield portion 41 of the magnetic shield 4 in the thickness direction becomes magnetic. There is a possibility that the voltage may be applied to the detection unit 2. Furthermore, if the length W exceeds ₄ mm, there is a risk that the disturbance magnetic field _H in the Y direction may pass through the slit section 42 and be applied to the magnetic detection section 2.

According to the third aspect of the current sensor 1 having the above-described configuration, it is possible to suppress the influence of the disturbance magnetic field _HX in the X direction and the disturbance magnetic field _HY in the Y direction, so that the current flowing through the conductor 5 can be It can be detected with high accuracy.

A fourth aspect of the current sensor 1 according to this embodiment will be described. Note that the same configurations as those in the first to third aspects described above are given the same reference numerals, and detailed explanation thereof will be omitted. As shown in FIGS. 24 to 26, the fourth aspect of the current sensor 1 includes a magnetic detection section 2 capable of detecting magnetism, a magnetic flux collecting core 3, a magnetic shield 4, and a conductor 5 through which current flows in the Z direction. Be prepared.

The magnetic flux collecting core 3 includes a first core part 31 that is substantially parallel to the Z direction, and a second core that is continuous to both ends 31A and 31B of the first core part 31 in the X direction and extends in the Y direction (+Y direction). portion 32 and a third core portion 33. A gap (space) sandwiched between the vicinity of the end of the second core part 32 and the vicinity of the end of the third core part 33, which face each other in the X direction, is the core gap CG. That is, the magnetic flux collecting core 3 has a core gap CG and is a substantially U-shaped core when viewed along the Z direction. In the fourth aspect, the magnetic flux generated from the conductor 5 and focused on the magnetic flux collecting core 3 exits from the end of the second core part 32 or the end of the third core part 33 and reaches the end of the third core part 33. or absorbed by the end of the second core part 32, but "near the end of the second core part 32" and "near the end of the third core part 33" refer to the end of the second core part 32 and It can be defined as a region where the magnetic flux comes out at the end of the third core section 33, and a region where the magnetic flux is absorbed at the end of the second core section 32 and the end of the third core section 33. The region where this magnetic flux is emitted or absorbed can be determined by, for example, magnetic simulation.

The length L _CG of the core gap CG in the X direction (the distance in the X direction between the vicinity of the end of the second core part 32 and the vicinity of the end of the third core part 33) may be 6 mm or more, for example. It is sufficient if it is about 12 mm. Since the length L _CG is 6 mm or more, the effect of the current sensor 1 according to the present embodiment including the magnetic shield 4, that is, the disturbance magnetic field is prevented from being applied to the magnetic detection section 2 by the magnetic shield 4. The suppressing effect can be effectively achieved.

The magnetic shield 4 includes a first shield part 43 and a second shield part 44 that are continuous with both ends 41A and 41B of the plate-shaped shield part 41 in the Z direction and extend along the Y direction. The length L ₄₁ of the plate-shaped shield portion 41 in the X direction is the same as the length L 43 of the first shield portion ₄₃ in the X direction and the length of the second shield portion 44 in the X direction. That is, the magnetic shield 4 has a substantially U-shape when viewed along the X direction.

In the fourth aspect of the current sensor 1 according to the present embodiment, the magnetic shield 4 includes a first shield part 43 and a second shield part 44 that are continuous to both ends 41A and 41B of the plate-shaped shield part 41 in the Z direction. The first shield part 43 and the second shield part 44 extend from both ends 41A, 41B of the plate-shaped shield part 41 in the -Y direction. Since the magnetic shield 4 includes the first shield part 43 and the second shield part 44, the disturbance magnetic field H _Y in the Y direction is induced to the first shield part 43 and the second shield part 44 (see FIG. 17A). ), it is possible to suppress the disturbance magnetic field H _Y from being applied to the magnetic detection section 2 . Further, since the disturbance magnetic field _HX in the X direction is induced from the fourth core part 34 or the fifth core part 35 of the magnetic flux collecting core 3 to the first shield part 43 and the second shield part 44 (see FIG. 17B), Application of the disturbance magnetic field _HX to the magnetic detection section 2 can be suppressed.

The first shield part 43 and the second shield part 44 have recesses 45 and 46 recessed in the +Y direction substantially at the center in the X direction. The lengths L ₄₅ and L _{46 of the recesses 45 and 46} in the X direction are not particularly limited as long as they are larger than the thickness of the conductor 5. In the fourth embodiment of the current sensor 1, the conductor 5 is provided so that its thickness direction is the X direction and extends in the Z direction. By arranging a portion of the conductor 5 within the recesses 45 and 46, it is possible to prevent the disturbance magnetic field _HY in the Y direction from being applied to the magnetic detection section 2 without increasing the overall size of the current sensor 1. The first shield part 43 and the second shield part 44 can have a suppressing effect.

The conductor 5 is provided so as to extend in the Z direction, with its thickness direction being the X direction and its width direction being the Y direction. By arranging the conductor 5 in this manner, the size of the current sensor 1 in the X direction can be made compact. On the other hand, if the conductor 5 is arranged in such a manner, the size of the current sensor 1 in the Y direction becomes large. By arranging a portion of the conductor 5 within the recesses 45 and 46, it is possible to prevent the current sensor 1 from increasing in size in the Y direction.

In the fourth aspect of the current sensor 1 according to the present embodiment, as shown in FIGS. 27A to 27D, a slit portion 42 penetrating in the Y direction may be formed in the plate-shaped shield portion 41 of the magnetic shield 4. The slit portion 42 may be formed so that its longitudinal direction is substantially parallel to the X direction (see FIG. 27A), or may be formed so that its longitudinal direction is substantially parallel to the Z direction. (see FIGS. 27B and 27C), or may be formed so that its longitudinal direction intersects the X direction and the Z direction (see FIG. 27D). One slit portion 42 may be formed in the plate-shaped shield portion 41 of the magnetic shield 4 (see FIGS. 27A, 27B, and 27D), or a plurality of slit portions 42 may be formed (see FIGS. 27A, 27B, and 27D). (see Figure 27C). The slit section 42 may be formed so as to overlap the magnetic detection section 2 when viewed along the Y direction, that is, at least a portion of the magnetic detection section 2 may be exposed from the slit section 42 ( (see FIGS. 27A, 27B, and 27D), and may be formed so as not to overlap the magnetic detection section 2 (see FIG. 27C).

In the fourth aspect of the current sensor 1 according to the present embodiment, if the slit portion 42 is not formed in the plate-shaped shield portion 41 of the magnetic shield 4, a part of the disturbance magnetic field H _Y in the Y direction The light is transmitted in the thickness direction of the shaped shield portion 41 (see FIG. 17A). As a result, the current sensor 1 may be affected by the disturbance magnetic field _HY .

On the other hand, since the slit part 42 is formed in the plate-shaped shield part 41, the disturbance magnetic field _H (Both sides in the Z direction). Therefore, when the slit section 42 is formed so as to overlap the magnetic detection section 2 when viewed along the Y direction, the disturbance magnetic field H _Y directed toward the magnetic detection section 2 along the Y direction is transmitted to the magnetic detection section. 2 can be effectively suppressed (see FIG. 19).

Note that if the slit portion 42 is formed so as not to overlap the magnetic detection portion 2 when viewed along the Y direction, the disturbance magnetic field that wraps around from the outside of the magnetic shield 4 and is induced into the magnetic shield 4 It is possible to suppress H _Y from affecting the current sensor 1 (see FIG. 12C).

In the embodiment shown in FIG. 27A, the length L ₄₂ of the slit portion 42 in the longitudinal direction (X direction) may be shorter or longer than the length L _CG of the core gap CG in the X direction. The length L may be the same as _CG . In the embodiments shown in FIGS. 27A to 27D, the length W ₄₂ of the slit portion 42 in the transverse direction may be, for example, about 1 to 4 mm, and preferably about 2 to 3 mm. If the length W ₄₂ is less than 1 mm, the effect of dispersing the disturbance magnetic field _HY by the slit portion 42 decreases, and the disturbance magnetic field _HY that passes through the plate-shaped shield portion 41 of the magnetic shield 4 in the thickness direction becomes magnetic. There is a possibility that the voltage may be applied to the detection unit 2. Furthermore, if the length W exceeds ₄ mm, there is a risk that the disturbance magnetic field _H in the Y direction may pass through the slit section 42 and be applied to the magnetic detection section 2.

According to the fourth aspect of the current sensor 1 having the above-described configuration, it is possible to suppress the influence of the disturbance magnetic field H in the _X direction and the disturbance magnetic field _H in the Y direction. Can be detected with high accuracy.

A fifth aspect of the current sensor 1 according to this embodiment will be described. Note that the same configurations as those in the first to fourth aspects described above are given the same reference numerals, and detailed description thereof will be omitted. As shown in FIGS. 28 to 30, the fifth aspect of the current sensor 1 includes a magnetic detection section 2 capable of detecting magnetism, a magnetism collecting core 3, a magnetic shield 4, and a conductor 5 through which current flows in the Z direction. Be prepared.

In the fifth aspect of the current sensor 1 according to the present embodiment, the magnetic shield 4 includes a first shield part 43 and a second shield part 44 that are continuous to both ends 41A and 41B of the plate-shaped shield part 41 in the Z direction. The first shield part 43 and the second shield part 44 extend from both ends 41A, 41B of the plate-shaped shield part 41 in the -Y direction. Since the magnetic shield 4 includes the first shield part 43 and the second shield part 44, the disturbance magnetic field H _Y in the Y direction is induced to the first shield part 43 and the second shield part 44 (see FIG. 17A). ), it is possible to suppress the disturbance magnetic field H _Y from being applied to the magnetic detection section 2 . Further, since the disturbance magnetic field _HX in the X direction is induced from the fourth core part 34 or the fifth core part 35 of the magnetic flux collecting core 3 to the first shield part 43 and the second shield part 44 (see FIG. 17B), Application of the disturbance magnetic field HX to the magnetic detection section 2 can be suppressed.

The length L ₄₁ of the plate-shaped shield portion 41 in the X direction is longer than the length L 43 of the first shield portion ₄₃ in the X direction and the length of the second shield portion 44 in the X direction. The length L 43 of the first shield part ₄₃ in the X direction and the length of the second shield part 44 in the X direction may be the same as the length L _CG of the core gap CG in the X direction, or It may be longer or shorter than _LCG .

In the fifth aspect of the current sensor 1 according to the present embodiment, as shown in FIGS. 31A to 31D, a slit portion 42 penetrating in the Y direction may be formed in the plate-shaped shield portion 41 of the magnetic shield 4. The slit portion 42 may be formed so that its longitudinal direction is substantially parallel to the X direction (see FIG. 31A), or may be formed so that its longitudinal direction is substantially parallel to the Z direction. (see FIGS. 31B and 31C), or may be formed so that its longitudinal direction intersects the X direction and the Z direction (see FIG. 31D). One slit portion 42 may be formed in the plate-shaped shield portion 41 of the magnetic shield 4 (see FIGS. 31A, 31B, and 31D), or a plurality of slit portions 42 may be formed (see FIGS. 31A, 31B, and 31D). (see Figure 31C). The slit section 42 may be formed so as to overlap the magnetic detection section 2 when viewed along the Y direction, that is, at least a portion of the magnetic detection section 2 may be exposed from the slit section 42 ( (see FIGS. 31A, 31B, and 31D), and may be formed so as not to overlap the magnetic detection section 2 (see FIG. 31C).

In the fifth aspect of the current sensor 1 according to the present embodiment, if the slit portion 42 is not formed in the plate-shaped shield portion 41 of the magnetic shield 4, a part of the disturbance magnetic field H _Y in the Y direction The light is transmitted in the thickness direction of the shaped shield portion 41 (see FIG. 17A). As a result, the current sensor 1 may be affected by the disturbance magnetic field _HY .

On the other hand, since the slit part 42 is formed in the plate-shaped shield part 41, the disturbance magnetic field _H (Both sides in the Z direction). Therefore, when the slit section 42 is formed so as to overlap the magnetic detection section 2 when viewed along the Y direction, the disturbance magnetic field H _Y directed toward the magnetic detection section 2 along the Y direction is transmitted to the magnetic detection section. 2 can be effectively suppressed (see FIG. 19).

Note that if the slit portion 42 is formed so as not to overlap the magnetic detection portion 2 when viewed along the Y direction, the disturbance magnetic field that wraps around from the outside of the magnetic shield 4 and is induced into the magnetic shield 4 It is possible to suppress H _Y from affecting the current sensor 1 (see FIG. 12C).

In the embodiment shown in FIG. 31A, the length L ₄₂ of the slit portion 42 in the longitudinal direction (X direction) may be shorter or longer than the length L _CG of the core gap CG in the X direction. The length L may be the same as _CG . In the embodiments shown in FIGS. 31A to 31D, the length W ₄₂ of the slit portion 42 in the transverse direction may be, for example, about 1 to 4 mm, and preferably about 2 to 3 mm. If the length W ₄₂ is less than 1 mm, the effect of dispersing the disturbance magnetic field _HY by the slit portion 42 decreases, and the disturbance magnetic field _HY that passes through the plate-shaped shield portion 41 of the magnetic shield 4 in the thickness direction becomes magnetic. There is a possibility that the voltage may be applied to the detection unit 2. Furthermore, if the length W exceeds ₄ mm, there is a risk that the disturbance magnetic field _H in the Y direction may pass through the slit section 42 and be applied to the magnetic detection section 2.

According to the fifth aspect of the current sensor 1 having the above configuration, it is possible to suppress the influence of the disturbance magnetic field _HX in the X direction and the disturbance magnetic field _HY in the Y direction, so that the current flowing through the conductor 5 can be suppressed. Can be detected with high accuracy.

The current sensor 1 according to this embodiment having the above-described configuration may be included in an electrical control device. Note that examples of the electric control device in this embodiment include a battery management system, an inverter, a converter, etc. of a hybrid electric vehicle (HEV), an electric vehicle (EV), and the like. The current sensor 1 according to this embodiment is used to measure input/output current from a power source and output information regarding the measured current to an electrical control device.

The embodiments described above are described to facilitate understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above embodiments is intended to include all design changes and equivalents that fall within the technical scope of the present invention.

In the third aspect of the current sensor 1 according to the above embodiment (see FIG. 20 etc.), the magnetic shield 4 is a first shield that is continuous with both ends of the plate-shaped shield part 41 in the Z direction and extends along the Y direction. and a second shield part.

Hereinafter, the present invention will be explained in more detail with reference to test examples, but the present invention is not limited to the following test examples.

[Test Example 1]
In the current sensor 1 having the structure shown in Fig. 1, the output signal from the current sensor 1 when the disturbance magnetic field _HX in the X direction is set to 0 mT (miltesla) and the output signal from the current sensor 1 when the disturbance magnetic field _HX in the X direction is set to 10 mT. Each of the output signals from the current sensor 1 was obtained by simulation, and the error (EX, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field HX in the X direction was calculated (Sample 1). Similarly, the output signal from the current sensor 1 when the disturbance magnetic field H _X in the Y direction is set to 0 mT (miltesla) and the output signal from the current sensor 1 when the disturbance magnetic field H _X in the Y direction is set to 10 mT. Each was determined by simulation, and the error (EY, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _HY in the Y direction was calculated (Sample 1). The simulation results are shown in Table 1.

[Test Example 2]
The error (EX,%) of the output signal of the current sensor 1 caused by the disturbance magnetic field _H in the X direction and the error in the Y direction The error (EY, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _HY was calculated (Sample 2). The simulation results are shown in Table 1.

[Test Example 3]
The error (EX, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _H in the X direction and the error in the Y direction The error (EY, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _HY was calculated (Sample 3). The simulation results are shown in Table 1.

[Test Example 4]
The error (EX,%) of the output signal of the current sensor 1 caused by the disturbance magnetic field _H in the X direction and the error in the Y direction The error (EY, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _HY was calculated (Sample 4). The simulation results are shown in Table 1.

[Test Example 5]
The error (EX, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _H in the X direction and the error in the Y direction The error (EY, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _HY was calculated (Sample 5). The simulation results are shown in Table 1.

[Test Example 6]
The error (EX, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _H in the X direction and the error in the Y direction The error (EY, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _HY was calculated (Sample 6). The simulation results are shown in Table 1.

[Test Example 7]
The error (EX, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _H in the X direction and the error in the Y direction The error (EY, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _HY was calculated (Sample 7). The simulation results are shown in Table 1.

[Test Example 8]
The error (EX, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _H in the X direction and the error in the Y direction The error (EY, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _HY was calculated (Sample 8). The simulation results are shown in Table 1.

[Test Example 9]
The error (EX, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _H in the X direction and the error in the Y direction The error (EY, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _HY was calculated (Sample 9). The simulation results are shown in Table 1.

[Test Example 10]
_The error ( EX, %) and the error (EY, %) of the output signal of the current sensor 1 caused by the disturbance magnetic field _HY in the Y direction were calculated (Sample 10). The simulation results are shown in Table 1.

From the results shown in Table 1, Test Examples 1 to 9 (Sample 1-9) using the current sensor 1 having the magnetic shield 4 were better than Test Example 10 (Sample 10) using the current sensor without the magnetic shield 4. It has become clear that it is possible to reduce errors in the output signal of the current sensor 1 that may be caused by at least the disturbance magnetic field _HX in the X direction.

Furthermore, from the results of Test Example 1 (Sample 1), Test Example 2 (Sample 2), and Test Example 3 (Sample 3), it was found that the slit portion 42 was formed in the plate-shaped shield portion 41 of the magnetic shield 4. It has become clear that it is possible to reduce errors in the output signal of the current sensor 1 that may be caused by the disturbance magnetic field _HX in the X direction and the disturbance magnetic field _HY in the Y direction.

Furthermore, from the results of Test Example 1 (Sample 1) and Test Example 4 (Sample 4), the magnetic shield 4 is connected to the plate-shaped shield part 41 and the first shield part 43 and the first shield part 43 that are continuous to both ends 41A and 41B in the Z direction. It has become clear that by having the second shield part 44, it is possible to reduce errors in the output signal of the current sensor 1 that may be caused by the disturbance magnetic field _HX in the X direction and the disturbance magnetic field _HY in the Y direction.

[Test Example 11]
Current sensor 1 (Sample 11) has the structure shown in FIG. 13 and uses silicon steel (50H230, manufactured by Nippon Steel Corporation, iron loss: 2.3 W/kg) as the constituent material of the magnetic collecting core 3 and magnetic shield 4. The amount of attenuation (dB) of the magnetic flux density applied to the magnetic sensing element 2 when the frequency of the alternating current flowing through the conductor 5 was varied in the range of 1 Hz to 100 kHz was determined by simulation. The results are shown in FIG.

[Test Example 12]
A current sensor having the same structure as the current sensor 1 of Test Example 11 (Sample 11) except that silicon steel (50H470, manufactured by Nippon Steel Corporation, iron loss: 4.7 W/kg) was used as the constituent material of the magnetic shield 4. In sensor 1 (Sample 12), the amount of attenuation (dB) of the magnetic flux density applied to the magnetic sensing element 2 when the frequency of the alternating current flowing through the conductor 5 was varied in the range of 1 Hz to 100 kHz was determined by simulation. The results are shown in FIG.

[Test Example 13]
A current sensor having the same structure as the current sensor 1 of Test Example 11 (Sample 11) except that silicon steel (50H700, manufactured by Nippon Steel Corporation, iron loss: 7.0 W/kg) was used as the constituent material of the magnetic shield 4. In sensor 1 (Sample 13), the amount of attenuation (dB) of the magnetic flux density applied to the magnetic sensing element 2 when the frequency of the alternating current flowing through the conductor 5 was varied in the range of 1 Hz to 100 kHz was determined by simulation. The results are shown in FIG.

[Test Example 14]
A current sensor having the same structure as the current sensor 1 of Test Example 11 (Sample 11) except that silicon steel (50H1000, manufactured by Nippon Steel Corporation, iron loss: 10.0 W/kg) was used as the constituent material of the magnetic shield 4. In sensor 1 (Sample 14), the amount of attenuation (dB) of the magnetic flux density applied to the magnetic sensing element 2 when the frequency of the alternating current flowing through the conductor 5 was varied in the range of 1 Hz to 100 kHz was determined by simulation. The results are shown in FIG.

As shown in FIG. 32, it has become clear that the frequency characteristics of the current sensor 1 can be improved by having the core loss of the material constituting the magnetic flux collecting core 3 smaller than the core loss of the component material of the magnetic shield 4. . Therefore, since the magnetic flux collecting core 3 is made of a material having a smaller core loss than the material of the magnetic shield 4, the output from the current sensor 1 can be stabilized even when an alternating current flows through the conductor 5. can.

1...Current sensor 2...Magnetic detection section 3...Magnetic collecting core 4...Magnetic shield 5...Conductor

Claims (14)

A current sensor for detecting magnetism generated from a current flowing in a first direction in a conductor,
comprising a magnetic detection unit capable of detecting the magnetism, a magnetism collecting core, and a magnetic shield,
The magnetic flux collecting core includes a first core portion substantially parallel to the first direction, and a second core portion continuous to both ends of the first core portion in a second direction orthogonal to the first direction. and a third core part,
The second core portion and the third core portion each extend from an end of the first core portion along a third direction perpendicular to the first direction and the second direction,
The magnetic detection unit is located in a core gap sandwiched between the vicinity of an end of the second core part and the vicinity of an end of the third core part in the third direction,
The magnetic shield includes a plate-shaped shield portion located so as to overlap the core gap, the vicinity of an end of the second core portion, and the vicinity of an end of the third core portion when viewed along the third direction. including;
When viewed along the first direction, the magnetic shield includes a side opposite to the magnetic detection section in the first core section along the third direction, and a second core section along the second direction. A current sensor characterized in that the current sensor is not located on the opposite side of the third core section and on the opposite side of the second core section in the third core section along the second direction. The magnetism collecting core further includes a fourth core part continuous to the vicinity of the end of the second core part and a fifth core part continuous to the vicinity of the end of the third core part,
The fourth core portion and the fifth core portion extend toward each other along the second direction,
The plate-shaped shield portion is located so as to overlap the core gap, the fourth core portion, and the fifth core portion when viewed along the third direction. current sensor. The current sensor according to claim 1 or 2, wherein the conductor is a plate-shaped body whose thickness direction is the third direction and extends in the first direction. The current sensor according to claim 1, wherein the conductor is a plate-shaped body whose thickness direction is the second direction and extends in the first direction. The magnetic shield includes a first shield part and a second shield part that are continuous with both ends of the plate-shaped shield part along the first direction and extend along the third direction,
When viewed along the first direction, the magnetic detection section is located within the core gap sandwiched between the first shield section and the second shield section. The current sensor according to any one of the above. 6. The current sensor according to claim 1, wherein the plate-shaped shield portion has a slit portion penetrating in the third direction. The current sensor according to claim 6, wherein the longitudinal direction of the slit section substantially coincides with the first direction when viewed along the third direction. The current sensor according to claim 6, wherein the longitudinal direction of the slit section substantially coincides with the second direction when viewed along the third direction. The current sensor according to any one of claims 6 to 8, wherein a plurality of the slit portions are formed in the plate-shaped shield portion. 10. The current sensor according to claim 1, wherein an iron loss of a constituent material of the magnetic shield is larger than an iron loss of a constituent material of the magnetic collecting core. 11. The current sensor according to claim 1, wherein the magnetic detection section includes a magnetoresistive element or a Hall element. The current sensor according to claim 11, wherein the magnetoresistive element is a GMR element or a TMR element. The conductor is provided so as to penetrate along the first direction through a space formed by the first core part, the second core part, and the third core part of the magnetic flux collecting core. The current sensor according to any one of claims 1 to 12. An electrical control device comprising the current sensor according to claim 13.

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